What is a Type 3 acromion?
The type II acromion is more curved and downward dipping, and the type III acromion is hooked and downward dipping, obstructing the outlet for the supraspinatus tendon.3 Cadaveric studies have shown an increased incidence of rotator cuff tears in persons with type II and type III acromions.2,3.
What is acromion Downsloping?
Objective: The anterior acromion may appear to slope downward in a lateral direction on coronal-oblique magnetic resonance (MR) images of the shoulder. We sought to determine the significance of this finding as a marker of rotator cuff impingement.
How common is type 3 acromion?
The distribution of acromial types was as follows: type I, flat, 51 (12.1%); type II, curved, 239 (56.5%); type III, hooked, 122 (28.8%); and type IV, convex, 11 (2.6%).
What is Type acromion?
A type II acromion is considered to be one that in which the acromion has a down-sloping character. • A type III acromion is considered to be present when there is significant downward hooking of the acromion consequently greatly restricting the caliber of the subacromial arch area.
What are the different types of MPS III?
MPS III is divided into types IIIA, IIIB, IIIC, and IIID, which are distinguished by their genetic cause. The different types of MPS III have similar signs and symptoms, although the features of MPS IIIA typically appear earlier in life and progress more rapidly.
What is the undersurface of a type I acromion?
A type I acromion has a flat undersurface and is least often associated with rotator cuff disease (Fig. 6a). A type II acromion has a concave curved undersurface, and represents a moderate risk for impingement syndrome (Fig. 6b). A type III acromion has a hooked downward facing leading edge (Fig.
Which is the most accurate description of acromion morphology?
Acromion morphology (types) are based on sagittal oblique MRI: flat inferiorly (12%) 6 curved (56%) parallel to the humeral head with a concave undersurface hooked (29%) the most anterior portion of the acromion has a hooked shape convex (upturned) (3%) most recent classification of acromion process shape
What causes mucopolysaccharidosis type III ( MPS III )?
Mucopolysaccaridosis type III (MPS III) is a rare genetic condition that causes fatal brain damage. It is also known as Sanfilippo syndrome and is a type of childhood dementia. MPS III is caused by a lack of an enzyme that normally breaks down and recycles a large, complex sugar molecule called ‘heparan sulphate’.